factorise 1-9/16 a^6x^2
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Given that: x
2
−
16
9
=x
2
−
4
2
3
2
=x
2
−(
4
3
)
2
=(x+
4
3
)(x−
4
3
), since a
2
−b
2
=(a+b)(a−b)
The factors of x
2
−
16
9
are (x+
4
3
)(x−
4
3
),
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